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Mike Miljanovic · 05-25-2024, 06:09 PM

Hello; I heard that Shell has reduced or eliminated ZDDP from their formula (pressure from the EPA!) Rislone makes the best additive; contains both zinc & phosphorus. The STP additive is way too viscous & only contains zinc. We use synthetic oil in our stocker: 5w20 in spring/fall & 5w30 in the hot weather. (for what's it worth)

05-25-2024, 06:09 PM	#24
Mike Miljanovic Junior Member Join Date: Jan 2006 Location: Ancaster ON Canada Posts: 13 Likes: 3 Liked 6 Times in 6 Posts	Re: Best place to buy Rotella Hello; I heard that Shell has reduced or eliminated ZDDP from their formula (pressure from the EPA!) Rislone makes the best additive; contains both zinc & phosphorus. The STP additive is way too viscous & only contains zinc. We use synthetic oil in our stocker: 5w20 in spring/fall & 5w30 in the hot weather. (for what's it worth)