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Do a mileage check, then change the engine, diff, and manual trans (if so equipped) oil to a quality synthetic (preferably Amsoil, IMO). Repeat mileage check with same driving technique and usage (all highway or all city or daily commute with no differences, etc.). Cheap thing to try for maybe up to one mpg increase. Possibly two.
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'71 GMC K20 Suburban, '71 GMC K10 Suburban, '72 Chevy C10 CST Suburban, '72 Chevy K20 clunker pickup.
Last edited by 4x4Poet; 08-26-2005 at 05:47 AM.
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