Quote:
Originally Posted by soslow
I think that I am more concerned with the issue that the owners manual clearly states "For the LT5 engine use only 10w-30 weight oil" an it is also printed on the oil filler cap and I specifically told the shop to use it. But, alas, they used 5w-30 instead and didn't tell me. I didn't want to be neurotic about it, as the experts at Vette Doctors said it would be OK, but I had to be forced to do the research after the fact to put my mind at ease after the deed was done. Reading that specific sentence in the manual made me concerned, I felt for good reason as I am not a mechanic.
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Yes, I understand your concern, and rightfully so.....but also understand that oil technology has jumped leaps and bounds since the 90's and before.....I do not have my owners manual in front of me, but sometimes, (not saying the ZR-1 manual does), the oil recommendation will cover a more slightly given range according to your climate conditions where you live.
I now use Mobil 1 10W-40 High Mileage in mine. Went on recommendations of the ZR-1 experts here on the forum, which there are quite a few....
I am not concerned about cold weather starting at all. Mine is garaged, and regardless of what time of year it is, when I start the Z, I back out and let it warm up so that the coolant reaches 200 degrees and above. In doing that the oil temp also gets near the correct operating temps that it should be for wide open throttle operation if need be.....this way I avoid jumping on the highway and maybe using more throttle than necessary on a cold engine to get into the flow of traffic. Overkill.....probably, but that's what I do. You will do more damage to your engine using more throttle (then need be) when cold and not fully at operating temps, than being concerned about your oil weight (viscosity)difference between a 5W & 10W oil.
Do not take this the wrong way, you did the right thing in asking questions and doing your research. At my age I still do research
and constantly learn each day. And again, these are JMO's, from my experience of car ownership of some very high mileage motors throughout my years.
Enjoy your Z, always check your fluids, tighten up all of the "screw" connections on the engine every so often, (vibration=loose screws) which can turn into annoying leaks..(of different kinds). Get into the habit of doing PM's (Preventative Maintenance) on a periodic basis, and you will have many enjoyable years of ownership.....
