If the Silverado is 'running great', then take your time. Get a compression test done on it as a baseline reference from here on out.

My roomie is well on the way with dialing 400K onto her 97 Corolla, and I've got a long way to go on my 4Runner with 220K and no end in sight.

Compression on her car is low, but within limits; I'll check the 4Runner's once the weather warms up, so I can do post-winter inspection.

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