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you can buy synthetic oil (even Mobil ) at Walmart real cheap. I use (walmart) Supertech Synthetic 5w-30 in my daily drivers and Mobil 1 10w-30 in my 72 Suburban with original 307. I'd rather do the job myself and put the $$$ I save towards better oil. I only use conventional dino juice in a vehicle that is one step away from the grave or the engine is burning oil like crazy. i don't bother with that Lucas oil, but i recommend a bottle of ZDDP additive in older engines running a slider cam (that includes all 2.2/2.5's before 1988) because modern oils don't have the quantity of zinc they once did since roller cams have so much less friction. a good idea long term would be to upgrade your camshaft.
 
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