RE: q? To all who use synthetic
 

Something that caught my eye here is that you guys use 5-30 in the summer. Now i know 10-30 is what is recomended for the 00-05 (non sc that is) but does it make much of a difference really. Is that much strain releaved by using the thinner grain 5-30? By the way i use quaker state horsepower 10-30 all year and only go 4k at max before changing.