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weight oil for summer in Texas for 86 Brat


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10w-40 or 10-30 is what the comp said when i worked at a lube shop, i run delo15w-40 in my er27, and ive known a few people to run that in ea81's and ea82's. i think 10-30 is light unless its cold or you just rebuilt it and it has tight tolerences.

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Castrol GTX 20-50 in the summer for me the last 30+ years. 10-40 in the winter. I guess if I had something really fresh and tight, I might go thinner, but never owned anything really with less than 100k miles. I know synthetic is superior, and will go for a lot more miles, but I just can't stand to run dirty oil in my engines. When it starts getting dirty, about 4k, I change it. Synthetic, for my usage, is not worth the extra cost. Maybe for much higher horsepower? Since I've used Castrol, I've never had a bearing or piston failure of any kind, EVER! My EJ22 daily driver has almost 500k hard miles, puling trailers, etc. I have a lead foot and drive aggressively. That engine has never been apart, and still has 180 psi compression in all 4 cylinders... I don't know how I could give a better testimonial. 

Be aware that some recommendations, even from the factory, are influenced by factors other than what is best for engine longevity. The trend toward thinner oils is MOSTLY just to get better mileage ratings. The increased oil change intervals are pretty much all about less cents-per-mile. Which is how many cars are rated by Consumer reports, etc. and what fleet buyers base their decisions on. I was told this by a Subaru factory rep. Of course, oils ARE much better now than in the past, and you CAN get away with less frequent changes. But I think I'll stick to my program boys, thank you.

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