Quote:
Originally Posted by zx9rmal
I thought I would post this experience. I'm a very knowledgeable car guy. I no longer change my own oil. At 73, I'm not as inclined anymore.
So, I've been reluctantly using the dealer, who makes sure their hi perf guy does it. I've had no problems so far and I don't leave the dealer without checking the oil level.
I used a well known, well respected performance shop a while back to dyno my car, so I thought I'd let them do the oil change. I asked what oil they use. I was told AC Delco. I asked why. I was told it was "because Mobil 1 isn't very good". Huh? Interesting. Then, I asked exactly what AC Delco oil they use. He said 5W-30. I told him the owner's manual calls for 0-40.
Here's what he said:
"We use 5w30 being it is a much better choice over the recommended 0w40 that the dealership uses, especially for our hot environment."
Is it me, or does this not make sense?
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Your experience is serving you well. The the shop is clueless if they are trying to sell you on "lower viscosity oil is better in a hot environment."
They probably a) would have to special order it, and b) just don't want to pay double for the good stuff... even though they'd just upcharge you for it.