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Gosh, all this work...and all I've done for the past 14 years to my 1990 Mazda Protege (SOHC, 5spd manual transmission) is change the Mobil 1 every 6-7K miles along with the Mobil 1 oil filter. And with 201,000 miles on the odo it's still getting 35mpg on the highway (Texas, AC on) and is still...

Al will this work on an aluminum head? I really gave those plugs (1,3,4) some good turns and none of them felt like #2- he broke and after that you could hand turn. These others didn't really break- they just began to give and then after a turn or two began to tighten up again which made wonder...

Thanks guys for the update on the GL-4/5 applicability to my situation- I was afraid that was the case. I wasn't clear on what plugs I was referring to however- it's the (gulp) spark plugs. Research on Google groups seems to indicate pulling the heads to get them out. Yee-haw, he said tiredly...

Guys thanks for all the great info! My daily driver is a '90 Protege 1.8l, SOHC, 5spd @ 185K miles. Two questions please: 1) Finally checked the transmission level about 20,000 miles ago and it was down 2qts(!) (Sorry, my previous car, got it's transmission oil chgd every 60K). I'm wondering...