I just purchased a 1999 Chevy Tracker with the 2.0 Suzuki engine. It is purportedly a one owner vehicle. There appears to be trace amounts of sludge around the oil cap and the inside of the engine is definitely varnish coated. I have three bottles of Auto-Rx on order.
Are these engines known to be particularly prone to sludge?
Are these engines known to be particularly prone to sludge?