I took my 67 BB in for the 1st oil change & filter. (new purchase) I,m not sure what weight oil was in it before but it was still clean. I put mobil 1 10-30 in. The oil pressure at idle sits at 50 pds. Before it sat at 30 pds.which seems normal. I don't understand why the difference. I do know the motor was rebuilt recently. But that shouldn't make any difference between oil types. Any Ideas???? Thanks, Don
-
-
Re: mobil 1
It depends on what SAE grade was in before, but all '67 BBs were equipped with a 55-6O psi relief spring and an 80 psi gage; 50 at idle with the oil at normal operating temperature does seem a bit high, but the real question is what is the highest reading you see with the oil fully warmed up at medium to high revs?
Mobil 1 is not the best choice for a vintage Corvette. Rather than starting another "oil war" I will refer you to a thread in another forum. Ignore the "Click and Clack" link in the first post. Go through the thread and read the comments GM Powertrain engineer "jestal" who has significant experience with engine development and oil types. Dare I say that he essentially recommends...
And don't shoot me. I'm just the messenger. I do' know nutin' about ool.
Duke -
Re: mobil 1
Duke,
"Jestal" sure knows what he is talking about! I have taken your recommendation last year and switched to deisel oil for my 67 and I really feel good about it now.
Thanks again...RickComment
-
Re: mobil 1
Thanks for that link Duke, I now have the perfect response to the "oil wars" that seem to erupt like clockwork on every car and motorcycle forum I am a member of. I have added that link to my "oil" file, which also has the "oil filter study" link too65 MM Convertible, L76 (365 hp)Comment
-
Re: mobil 1
Duke----
I totally agree with "jestal" regarding the fact that the only property which synthetic oil provides which conventional oils don't is higher temperature capability. I disagree with him, though, that such capability is, essentially, superfluous. It's true that the SYSTEM oil temperature of cars used in street operation will usually not exceed the limits of conventional oil. So, by that standard, the benefit of synthetic oil is, indeed, moot. However, there may well be LOCALIZED areas in the engine that the oil comes in contact with that exceed the SYSTEM oil temperature. That's where the benefit of the synthetic oil may be realized. Whether that capability and "insurance" is worth the extra cost of full synthetic oil is something that each car owner has to decide for themselves.
Basically, what "jestal" is also saying is that there's no downside to full synthetic oil, except for cost. I totally agree with that, too.
I also like the idea of the fuel saving, friction modifiers used in most recent oils for gasoline engine operation, synthetic and non-synthetic, even in older cars like ours. Personally, I like to achieve the highest fuel mileage possible. Even more important is the fact that the reduced friction that produces the higher fuel economy usually means the production of more power at the same time. Yes, the newer oils do have less of the EP additive (organo-zinc-based), but they are still rated and fully approved for use in all engines, including older ones. And, if someone is really concerned about this, add a quarter can of a product which contains a lot of the EP additive (like the GM EOS that "jestal" mentioned) to each oil change.In Appreciation of John HinckleyComment
-
Re: mobil 1
Having looked at this for years, as most of you have, I have to agree with Joe.
My primary concern with my 68 is overheating, with the gauge possibly not reading correctly due to old age or whatever, and that extra protection offered by synthetics is (or would be) appreciated at that point, given the fact that it's the original numbers matching motor. Given the fact that I drive it so few miles per year, the extra cost is not really a big concern.
I have also used synthetics in my other cars for years. But then again, I change them at 3 - 4K miles (with new filter, or course), or twice per year if I do not hit the milage requirement, so the extra cost is not that big a concern.
Then again, I have a good friend with a 250K miles original small block Chevy Pick up, and he's used regular old petro based motor oil all it's life, and it still runs like a champ. He thinks I'm nuts to spend the extra bucks.
Like you guys said, it's one of those personal choices you make.
Regards,
RichComment
Comment