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ford recommended change in 91 - 01 engine oil viscosity
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April 1st, 2003, 01:11 PM
mrmousepotato
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April 1st, 2003, 01:57 PM
It"s an effort to boost fuel mileage and also reduce cold engine emissions, but I"m not sure that it would minimize engine life measurably. Many engine wear wake up on startup, so the diluent the oil is, the better. At operating temps, the engine warm is managed over a pretty tight range, so exterior temperatures shouldn"t have actually much effect. It would be exciting though, to see a long-term study the engine wear based upon different multi-weight oils.


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after starting this thread, i determined to check out if an answer to my question already existed.lo, i uncovered one thing: the old adage about topics of conversation to it is in avoided needs to be expanded: "never talk about religion, politics, or motor oil ... ."nevertheless, and not wishing to start an additional heated controversy on the subject, mine consclusions and also observations are as complies with (based on what i review from those who seemed most knowledeable):1. There room a many of civilization who don"t review their owner"s manuals, and/or don"t provide a crap about what ford engineers have to say; e.g., "i"ve constantly used straight 30 weight," or "castrol 20w-50 works great in my chevette," etc. Ugh.2. The move by ford come 20 weight from 30 weight does, in fact, show up to it is in mainly, if not entirely, concerned fuel milage and also cold emissions considerations, return i can not find any type of posting whereby someone in reality knew, for a truth certain, what the bearing tolerances were, for example, ~ above both pre and also post 91(?) 4.6l engines.3. Switching from 30 load to 20 weight may boost oil consumption, particularly on an enlarge engine. This is continuous with my own understanding of the subject, return i recognize very little about it.4. 20 load oil might provide, end the long term especially, much less protection than 30 weight oil, although there might be no distinction whatsoever if the engine is, in fact, never driven at temperatures above 195 (?) degrees or pushed hard. But this seems a bit dicey ... The fact is the stuff happens to the cooling system now and again; occasionally it"s our fault, and also sometimes it"s simply one that those things. Too, i drive occasionally through california"s central valley in the summer time (110 levels in the shade). Perhaps ford take it that into account as soon as it design the car, maybe not.5. Missing real reasons to the contrary, that is a really bad idea to placed motor oils v a weight higher than 30 in one"s 9x city car"s 4.6l engine; together oil (40 weight, 50, whatever) is merely too special to uncover its method into critical passages v tight tolerances. This dominance may be relaxed in the instance of an enlarge engine and/or one through an oil usage problem (although this should be taken into consideration only a temporary fix).6. The fuel milage development gained by convert from 30 weight to 20 weight oil room small; part reported no discernable difference whatsover. Might be one of those "milage may vary" things. Seems logical, though, that milage should improve: oil flows easier, ergo, much less friction, much less resistance. Inquiry is, though, does one thereby save $20 worth of fuel, only to pay $30 worth of repairs? dunno.7. One factor to consider is that all these oils "shear out" over time, for this reason a 30 load oil ends up in ~ some suggest with the very same viscosity the a 20 weight oil, etc. Thus, does the follow that a 20 load oil will shear the end to a 10 weight over time? in 3,000 miles? of simple driving? dunno.8. Fabricated oils room in reality far superior to standard dino oils. Mobil 1 seems to be the selection of the "common man". Emphasis because of the reality that, also buying a case of it in ~ costco yesterday, it was still $4.00 a quart - about three or four times more expensive than the best conventional dino oils the end there. Yikes!9. The cogniscenti, however, pooh pooh even mobil 1, advocating commodities such as amsoil and rotelli (sp?). (for that matter, the mobil 1 proponents pooh pooh other synthetics, also those through castrol, et al.)10. Ns don"t know just how much this specialty commodities cost, but, in all of this, there has to be a cost/benefit rest point. Because that example, if one can use the highest possible quality typical motor oil in ~ $0.89 a quart (periodic sales/case prices), then one will certainly spend virtually exactly $15 more per oil adjust using mobil 1. Mine impression is the by religiously maintaining and carefully steering one"s 4.6l ford, one may realistically mean 300k the end of an engine. But, if my knowledge is correct, this is true also if one "merely" offers high high quality conventional engine oil, and also 3,000 mile oil change intervals. Accordingly, end the food of this 300k, one will spend just about $1,500 an ext using the synthetic oils. This $1,500 would take a big bite the end of the cost of rebuilding. So, unless it have the right to be shown that, by utilizing synthetics, one have the right to really, really expand oil change intervals by a far-reaching amount, and/or extend indefinately the life of your engine (i.e., it"ll never ever wear the end if one provides synthetics, drives carefully, and also maintains zealously), the seems choose one is going to pay more, perhaps a many more, to usage synthetics over time.this doesn"t mean it"s not a good idea, also so ... I mean, huge deal ... End that very same 3,000 miles one is going come dump, what?, $250 precious of gas? what"s another 15 bucks? after ~ all, one wouldn"t use crappy gas to save 15 bucks, would one?(sorry because that the present of conciousness there.)< April 03, 2003: blog post edited by: mrmousepotato >< April 03, 2003: post edited by: mrmousepotato >