Convenional vs Synthetic
- Thread starter Iowan
- Start date
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85 CA SIERRA 1500
Full Access Member
- Joined
- Feb 6, 2018
- Posts
- 59
- Reaction score
- 31
- Location
- So. Cal
- First Name
- TRACEY
- Truck Year
- 1985
- Truck Model
- SIERRA CLASSIC
- Engine Size
- 5.0
I vote YES GO SYNTHETIC,,,,for more info check out Bob Is The Oil Guy
Shorty81
Baby Boomer
- Joined
- Mar 19, 2018
- Posts
- 3,101
- Reaction score
- 5,778
- Location
- North West ohio
- First Name
- Darren
- Truck Year
- 86
- Truck Model
- K20
- Engine Size
- 496
I use Shaeffer 15w 40 synthetic blend with extra zinc for flat tappet engines
