1991 Chevrolet K1500 with 4.3 V6 has blue smoke on startup. I'm sure it is the valve stem seals. Engine has 87k miles and was a short-tripper (28k miles in 20 years by the school where I am employed). I purchased it in March and average 500 miles per month. The smoke seems to have gotten worse with Auto-Rx. I'm about 1500 miles into the Auto-Rx treatment. The oil was last changed by the school a year ago, but only had 1k miles on the OCI when I purchased it. I'm wondering if things will get better after the rinse phase.
I'm tempted to go ahead and change the oil now and add Mobil Super HM or PYB. The truck will see more mileage during warmer weather than it will in the winter. I would like to get to the rinse phase before winter and hope a HM oil may have some effect on reconditioning the seals.
I'm tempted to go ahead and change the oil now and add Mobil Super HM or PYB. The truck will see more mileage during warmer weather than it will in the winter. I would like to get to the rinse phase before winter and hope a HM oil may have some effect on reconditioning the seals.