Frank,
That Supergard uses some of the group I+ " yes there is such thing "
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blended with group II .
I think the amounts of each vary to get the desired results like any maker does .
Citgo is not shy of additives in their low cost oils and they have a good 1.75 per quart 5 and 10w-30 real Pao blend along with a new High Mileage oil called Ultra Life that can be used in new engines but it only comes in 10w-30 and 10w-40 currently .
I'm not through
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They are making a couple group III 30wts for passenger cars , their history of low price , high additive treat rates might make this one a great bang for buck fake synthetic and I heard it will be less than 3.00 a quart
For most though , good luck finding any of it anywhere . Their distribution is spotty . The local Yellow pages to find Citgo marketers worked well for finding the blend I used a few times .