Lucman Posted March 12, 2004 Share Posted March 12, 2004 NUUUUUU, 15W40 e pentru masini mai vechi. Acea cifra din fata denota gradul de vascozitate daca stiu eu bine. Cu cat cifra e mai mica cu atat e mai lichid. Motoarele noi si ma refer la ale noi,au orifiicile foarte mici si de aceea se baga 0, daca bagi 15 in ele risti sa nu mai ai ungere Link to comment
FLEX Posted March 12, 2004 Share Posted March 12, 2004 Eu merg din principiu pe ulei cit mai sintetic, deci alegerea mea e clara: 5W30. Link to comment
zalmoxis Posted March 12, 2004 Share Posted March 12, 2004 mai eu stiam ca vascozitatea e aia ultima cifra !..Stie careva cum e si cu uleiurile astea !?Eu la Dacie bagam 29W50 BP vara si iarna 20W40 deci CUM E BAIATZI LAMURITI_MA SI PE MINE ...PUII MEI CU ULEIURILE ASTEA!!! Link to comment
FLEX Posted March 12, 2004 Share Posted March 12, 2004 Ufffff! trebuie sa caut ... si pe mine ma freaca chestia asta. Link to comment
Lucman Posted March 12, 2004 Share Posted March 12, 2004 Cred ca prima cifra reprezinta granularitatea Link to comment
Sunman Posted March 12, 2004 Share Posted March 12, 2004 5-40 w de la bp se cheama visco 5000 daca nu gresesc... mi se pare super uleiul Link to comment
Lucman Posted March 12, 2004 Share Posted March 12, 2004 Caracteristicile uleiului de motor: Indice de vascozitate (norme SAE) masurat printr-un indicator de tip ???10W40” 10: fluiditate la rece: cu cat cifra e mai joasa, cu atat pornirea la rece se face mai usor si uzura motorului este mai redusa W: inseamna winter (iarna) 40: indice de vascozitate la cald: acest numar indica rezistenta si capacitatea de ungere a uleiului la temperaturi ridicate Link to comment
NFS Posted March 12, 2004 Share Posted March 12, 2004 si atunci de ce n-am vazut uleiuri 10 S 50, unde S=summer ? Link to comment
FLEX Posted March 12, 2004 Share Posted March 12, 2004 Nu fiti circotasi, ca asa stiam si eu ... a doua cifra indica fluiditatea uleiului si cind motorul este cald, nu numai vara, prima cifra este viscozitatea la rece (w=winter). Cu prima cifra e destul de clar, cu cit este mai mica, cu atit viscozitatea la rece va fi mai mica, deci se asigura o pornire usoara; ciudatenia e ca la motoare de conceptie mai veche nu se prea recomanda uleiuri sub 15w; o fi din cauza ca la momentul aparitiei motoarelor nu se generalizase utilizarea uleiurilor sintetice? se poate ... Ce nu prea inteleg eu e ce face cifra a 2-a ... ce se intimpla cind creste sau scade. Link to comment
FLEX Posted March 12, 2004 Share Posted March 12, 2004 Lucman, ce spui acum se bate cap in cap cu postul tau de mai sus; cum naiba e pina la urma, ca eu am capiat de cap! Link to comment
brusli Posted March 12, 2004 Share Posted March 12, 2004 de calitatea uleiului pe care-l folositi va convingeti la peste 100000km mai vorbim Link to comment
Lucman Posted March 12, 2004 Share Posted March 12, 2004 Ulei - uleiul de motor este de diverse tipuri: SAE 5W-30, 10W-30, 10W-40, etc. De exemplu, uleiul de tip 10W-30 se va scurge precum uleiul usor de tipul SAE 10 la temperaturi scazute. W (winter - iarna) inseamna ca este un ulei de iarna. 30 este temperatura de functionare a motorului. Vascozitatea scazuta la temperaturi mici permite uleiului sa circule mai rapid si sa protejeze partile vitale ale motorului. Uleiul cu vascozitate ridicata, la temperaturi mari, previne contactul direct dintre partile metalice ale motorului. Link to comment
NFS Posted March 12, 2004 Share Posted March 12, 2004 Buuun, m-am documentat nitel pe internet, am dat pe google o http://www.gmclub.ro/forum/index.php?showtopic=15613&view=findpost&p=450382][url=http://www.gmclub.ro/forum/index.php?showtopic=15613&view=findpost&p=450382]cautare[/url]'> dupa "motor oil FAQ" si din ce am gasit am dedus asa: prima cifra = viscozitatea "la rece". Cu cit mai mica cu atat pornirea va fi mai usoara. W = inseamna ca uleiul indeplineste specificatiile de viscozitate la 0 grade Fahrenheit, deci prin urmare e bun pt a fi folosit iarna. Luc, ai avut drepate, sorry ca te-am contrazis in necunostinta de cauza. a doua cifra = arata limita maxima pina la care este posibil sa se "subtieze" uleiul la o temperatura de 100 grade Celsius. Link to comment
brusli Posted March 12, 2004 Share Posted March 12, 2004 Ulei - uleiul de motor este de diverse tipuri: SAE 5W-30, 10W-30, 10W-40, etc. De exemplu, uleiul de tip 10W-30 se va scurge precum uleiul usor de tipul SAE 10 la temperaturi scazute. W (winter - iarna) inseamna ca este un ulei de iarna. 30 este temperatura de functionare a motorului. Vascozitatea scazuta la temperaturi mici permite uleiului sa circule mai rapid si sa protejeze partile vitale ale motorului. Uleiul cu vascozitate ridicata, la temperaturi mari, previne contactul direct dintre partile metalice ale motorului. deci? Vascozitatea scazuta ori vascozitate ridicata? Link to comment
Lucman Posted March 12, 2004 Share Posted March 12, 2004 Ma nevrozez , pune ce scrie in cartea tehnica si garantez ca nu ai probleme Link to comment
brusli Posted March 12, 2004 Share Posted March 12, 2004 :? :? n-am carte tehnica la mine Link to comment
Lucman Posted March 12, 2004 Share Posted March 12, 2004 scrie 10W30 la Tico, dar eu i-am pus intotdeauna 10W40 si ai vazut ce bine merge Link to comment
brusli Posted March 12, 2004 Share Posted March 12, 2004 scrie 10W30 la Tico, dar eu i-am pus intotdeauna 10W40 si ai vazut ce bine merge ma repet "> fiindca nu mergi tu pe ea Link to comment
Lucman Posted March 12, 2004 Share Posted March 12, 2004 Offf, Sa vezi ce bine merge Dacia Mea cu ulei Multigrade Link to comment
brusli Posted March 12, 2004 Share Posted March 12, 2004 Offf, Sa vezi ce bine merge Dacia Mea cu ulei Multigrade iar o dai pe R12? nu ma(mai) intereseaza deloc Link to comment
FLEX Posted March 12, 2004 Share Posted March 12, 2004 Nu va pierdeti pacientza, ca e important ... Merem frumos la Biblie http://www.chris-longhurst.com/carbibles/i...tyre_bible.html , apasam pe "The Oil Engine Bible" si citim ... cind ajungem la paragraful "Viscosity and Viscosity Index (VI)" mergem pina la sfirsit si apasam pe "Viscozity Page"; este exhaustiv, pe intelesul tuturor, da inclusiv domeniile climatice de folosire a anumitor uleiuri. Ce am inteles eu: 1. prima cifra e viscozitatea la rece, cu cit mai mica, cu atit mai bine, dar nu este cazul sa exagerezi mergind in jos, pentru un climat in care rareori temperatura coboara sub -20gC e suficient 10, mai sigur 5. 2. a doua cifra e viscozitatea la cald, cu cit mai mare, cu atit mai bine, dar a nu se exagera nici aici in sus, pentru motorasele noastre e suficient 40, pentru 50 nu e chiar atit de cald la noi. 3. cifrele nu pot fi prea departate intre ele, din motive ce tin de tehnologie si mai ales de PRET; cel mai "cracanat" ulei ar fi 0w40, cel mai "ingust" 20w50, probabil ca o cracanare de 30-35 e convenabila din toate punctele de vedere, esential e sa pleci bine de jos. 4. daca motorul s-a invatat cu un ulei "mic" la prima cifra, este gresit sa bagi un ulei cu prima cifra mai mare (difera si tehnologia: sintetic, semisintetic, mineral); a doua cifra nu conteaza probabil. 5. e bine sa "cobori" de la o prima cifra mare la una mai mica, dar trebuie sa te gindesti bine fiindca nu prea e reversibil (vezi punctul 4). Astept comentarii si pareri ... eu m-am cam hotarit pentru 5w40, o fi bine? ©brusli Se gaseste ulei Daewoo 5w40? Link to comment
zalmoxis Posted March 12, 2004 Share Posted March 12, 2004 Deci voi fi injurat da'cred ca terminam cu topicul asta gata !!!! "The Society of Automotive Engineers Viscosity Classification The terms SAE 10W-30 and SAE 15W-40 are widely used. How many people actually understand what these terms mean? Firstly any viscosity grade should be proceeded by the initials SAE. This stands for the Society of Automotive Engineers and indicated that the following viscosity classification refers to their definitions. It should be noted that SAE is not a performance category it only refers to the viscosity of the oil. When comparing oils the reader should not only compare the SAE viscosity grades of two oils but also the engine performance classifications in order to be able to fully compare performance. Let us consider the following: SAE 15W-40. The fact that this classification has two parts; the 15W and the 40 indicates that the oil is a multigrade. The first number with the suffix 'W' indicates the oil's performance at low temperature. In fact the 'W' stands for winter. The lower the 'W' number the lower the viscosity of the oil. Therefore an SAE 5W oil is a lower viscosity oil than an SAE 10W oil. The number after the W, in the above case '40'; gives a measure of the oil's viscosity at high temperature. Again the lower the number the thinner the oil is at high temperature. So an SAE 30 is a thinner, or less viscous, oil than an SAE 40. A multigrade oils is an oil that has two parts such as SAE 15W-40, or 20W-50. A monograde oil only has one part, such as SAE 30, or SAE 40. The Chevron Supreme Range of Motor Oils offer wide range of viscosity grades to cover the wide variations in temperature experienced by the end users. Below is a comparison of the range of operating temperatures suitable for the various viscosity grades. The choice of viscosity grade is a difficult subject. The manufacturer's recommendations should be followed. If this not available then your Chevron dealer can help you select the correct grade. Common questions are asked: What is better a SAE 10W-40 or an SAE 15W-40? Using the simple rules above it is clear to see that both of these oils have a similar high temperature viscosity as indicated by the '40'. However the 10W-40 is a thinner oil than the SAE 15W-40 at cold temperatures. Simply apply the rule that the lower the 'W'; number the thinner the oil. The SAE 10W is lower than the SAE 15W and hence is a thinner oil. Therefore in cold temperatures we can state that the SAE 10W-40 oil is better than the SAE 15W-40 oil. In winter the end user may experience a benefit by moving from an SAE 15W-40 oil to an SAE 10W-40 oil. Can I use an SAE 10W-30 in summer During summer when ambient temperatures are high the oil will tend to be thinner so a more viscous oil should be preferred. The SAE 10W-30 is a thin oil so generally speaking either an SAE 10W-40 or SAE 15W-40, both more viscous, could offer better engine protection. In summer is an SAE 10W type oil required? Probably not so the SAE 15W-40 would be the best recommendation. As a first step the manufacturer's recommendations should be followed. In winter the situation is reversed and the SAE 10W-30 oil or the SAE 10W-40 should be favoured. Back to top Mineral Oils Versus Synthetic Oils There is much discussion about mineral oils versus synthetic oils and the relative performance of each type. It is clear that synthetic oils offer certain advantages over mineral oils in terms of low temperature performance, and high temperature oxidation stability but that is not the whole story. Synthetic oils are very expensive and properly formulated mineral oils are more than suitable for most engine applications. A synthetic oil can be considered for very cold temperatures, or for application that may need an outstanding level of oxidation protection but it should be remembered there is a significant cost. The question should always be asked: ‘Can I use a properly formulated mineral oil for this application?'" Link to comment
NFS Posted March 12, 2004 Share Posted March 12, 2004 ...5. e bine sa "cobori" de la o prima cifra mare la una mai mica, dar trebuie sa te gindesti bine fiindca nu prea e reversibil (vezi punctul 4). Aha! Adica ce ziceam eu aseara. Bah, deshtept m-a facut mama! Link to comment
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