After going thru a recent de-sludging, I was told by a mechanic that I may have initiated the problem when switching to synth. The engine had 60,000 miles when I got the car. I went straight to 20-50 synth castrol. He contends that when doing this, you must run the new synth oil up to operating temp, then immediately drain it, then fill with more synth and go. He says the synth fights with the remnants of the carbon-based oil. I have had three other mechanics refute this theory, however.
- posted
19 years ago