Remember, if you have roller rockers or hydraulic lifter then you're fine it just the cars where the cam acts directly on the lifter/bucket or if you have solid cams. I use Valvoline Synpower since it also has a higher ZDDP content. You can find the spec sheets for the different brands of oil to determine what each weight from the brands contain. If you can't find it, you can also request it from them as well.