Today is Monday the 30th (for time reference)
My 91 Sierra 5.7L has 156,000 miles on it, the oil pressure gauge on the
dash has been on the low side for obvious reasons. It has never gone into
the red zone just a couple of notches on the gauge before the red zone,
after using 5W-30, its low I know. I had a slight oil leak at the rear seal
which has been there for quite a while. I asked my mechanic to check the
oil pressure which he did, he said he would put in 40 or 50 weight oil.
This was done on Friday the 27th.
That same afternoon I left his shop to pick my wife up at work, round trip
at most, 12 miles. I go start the truck on Saturday morning and notice more
oil leaking out of it than ever. I let the truck sit on Saturday and Sunday.
This morning, Monday, more oil was leaking onto the driveway.
After a heated exchange in his shop he sent a tow truck to pick it up,
I was not about to drive it anywhere.
My question is, can the heavier weight oil blow out whatever pressure
sealing I had left in the engine.