I have 65k miles on my 94. It runs like a jewel. I've always had the oil changes, etc , done by the dealer, but this last time I went to a local auto shop. I have every confidence in these folks based on work they had done for me previously. This time they put in 10w-30 oil, and I had been running
10w-40. And I had to leave town on a 1500 mile trip immediately. Now, when the engine is hot, at idle the oil pressure drops down to 1.75 -
2.0 psi, and 3.75 at 2000 rpm. Previously, with 10w-40, the idle would not drop below 2.5 - 3.0 when hot, and always 4.25 at 2000rpm.
My question is this: Am I running a risk to leave the 10w30 in for the next
1500 miles or bring it back now and put 10w40 back in? It bothers me to see the oil pressure gauge waver around 1 - 2 at idle.
Thanks. Paul