Originally Posted By: JCCADILLACMOBILE
Originally Posted By: ekpolk
Good heavens, why not? I'm sure if you look hard enough, you'll find legions of folks who've been using xw-20 for the ten years in which Ford and Honda have been calling for its use, and with no harm at all.
Oils are not "good" or "bad" based upon their viscosity. Such value judgments only have meaning, regarding viscosity, when you add in the requirement of the engine involved. Look first to what your engine designers recommend (or occasionally require), and only after that should one get into debates about this grade is "better" or "worse" than another.
This may be the most Insightful Statement Ive had the Pleasure of Reading!!!
At this time, i have a 1095 Jaguar. The Heat and Humidity is STARTING to come (Humidity can be Felt even in a Mild Form) .. and my 4.2L Inline-6 -RECOMMENDS- 20W-50 in ALL But Winter! .. Then people use 10W-40.. So my Engine seems to like and have been DESIGNED for Nice, THICK Oil, being an Engien Design from the 1960s and 1970s...
Many. Many People, particularly those om the Jaguar Forum, state that as long as its not 50 or beloe (its about that at Night here now,) 20W-50 is fine, and in a vote, 7 Stated they used it.. One stated they use 10W-40.
The Smaller Engine people even seconded the motion (Jaguar 3.4L in the UK, even a 2.8)
.. So it seems my Particaular Car DOES NOT Like THIN Oilm,, and ive had people say, DO NOT use a THIN OIL in this car!!!
However.. it seems any pther car i may purchase, particularly a 4-cylinder.. Will be getting 5w30.
Thoughts?
P.S.: I have "11W-40" in my car now (Mixed available Viscosities including 2 Qts 20W-50 to get my grade,) and my Oil pressure seems OK.. 50-60PSI after 20 minutes Fully Warmed and 20Hot at Idle is OK, yes?)
Thanks!
P.S.2: Im leaving "1095" Jaguar in because even as a Typo, it is Funny.. but its a 1985 Jaguar, 152,000 Miles, Unknown History of the Engine.. Some indications say its very good condition -Great Oil Pressure, giood Sound, Solic, etc.. ... Some indicators say there MAY be Carbon and SLudge.. so im !!! Sopping up all this Info like a Sponge! Thanks!
My thoughts? Well first, don't move the cheese. The first question, in the original post, was regarding 5w30 oil in South Florida. For most modern cars, no problem at all.
Now, your Jag would appear to be a different "animal" as it were. Again, it's not a matter of 20w-50 being better or worse than 5w30. It's a simple matter of what your car needs and what it doesn't need. While we're at it, even "thick" and "thin" are relative terms. Compared to a lighter ow-20, the 12.5 cSt 0w30 that's been so popular here is a very thick oil. Compared to a 20w-50, it's thin.
Read you manual and use what the engineers intended for your car. If you want to take it a step further, do some UOA experimentation and see what appears to work best for your application.
