mhg@wjh12.UUCP (Michael Howard Goldstein) (11/07/85)
xxx questions about oil: who has experience with synthetic oils?? would they be silly in a big old American V8.I'm especially interested in the 'heavy' (15w-50) new Mobil 1. oil coolers: are the worth while, again in a big American V8 that is not driven too hard, and rarely sees ambient temps above 90F. are they hard to install? any experiance with Boston area auto painters? Car needs no body work but oild paint needs to be stripped. The car is fiberglass if that matters... much thanx in advance. Mike Goldstein
fern@polyof.UUCP ( FTG ) (11/23/85)
> xxx > questions about oil: > who has experience with synthetic oils?? > would they be silly in a big old American V8.I'm especially > interested in the 'heavy' (15w-50) new Mobil 1. > There seemes to be some confusion regarding "multi-weight" oils 5W-40 for example means that at some low temperature, the viscosity of the oil falls within some appropriate range, and at some other high temp the oil viscosity is still withinh that appropriate range. This means that at any temp inbetween the upper limit (which is defined by the big number) and the lower limit (defined by the little number) that the oil has a viscosity which falls into appropriate limits. For single grade oils 5 10 20 etc. the viscosity of the oil at room temp is almost always proportional to the number. For "mulitweight" oils the viscosity need bear no relation to the numbers, ie 5-30 maybe on average a higher viscosity oil than 5-40. The only thing that the numbering scheme ensures is that the viscosity is appropriate in the temp range defined by single weight numbers. FTG ps, as always dietz etz