What Engine oil do you use???????
TECH Enthusiast
Joined: Feb 2024
Posts: 619
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From: Haslet, TX
Anybody use the aftermarket additives such as STP, Lucas, Z-Max, Seafoam, etc... or is that for another thread? Years ago I used STP oil treatment in my 1990 GMC and it did nothing as far as I could tell. Waste of money. I bought a high mileage HHR (155k) and poured a half bottle of Seafoam in the oil 2 days before I changed the oil. Never used any additives in it since ( 218k now)
TECH Resident
Joined: Jul 2009
Posts: 755
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agreed. Seafoam is a fantastic product. A can in the crank case, a can in the gas tank, and a can through the brake booster hose will clean up any engine.
This should go without saying but don’t forget to change the oil and spark plugs after. lol
TECH Enthusiast
Joined: Feb 2024
Posts: 619
Likes: 309
From: Haslet, TX
I use Valvoline VR1 non-synthetic 10W30 in mine, as recommended by the cam supplier. Before it was modified I tried Royal Purple once.... my engine was never louder than with that garbage. No issues with Pennzoil/Mobil 1 synthetics when I ran them.
TECH Fanatic
Joined: Jan 2022
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Naphtha.
Last edited by Y2K_Frenzy; Apr 11, 2024 at 09:25 PM.
I have used Valvoline full synthetic 5W30 with Lucas ZDDP additive or VR1 10W30 but I prefer Amsoil Dominator or Redline and always WIX or K&N filters. The 1" hex nut on the K&N HP-2001 filters are a plus for me.
