Synthetic vs Conventional vs Synthetic Blend Motor Oil: Which Is Right?
October 24, 2026 · RPS Distributors
Customers ask this question every day at the parts counter: is synthetic oil worth it? The honest answer depends on the engine, how the vehicle is driven and what the manufacturer requires.
The three main types
- Conventional oil is refined from crude oil. It is the lowest-cost option and works well in many older, simpler engines with regular oil changes.
- Synthetic blend mixes conventional and synthetic base oils. It offers better protection than conventional at a moderate price.
- Full synthetic uses highly refined or chemically engineered base oils. It flows better in the cold, resists breakdown at high heat and keeps engines cleaner.
Quick comparison
| Conventional | Synthetic blend | Full synthetic | |
|---|---|---|---|
| Cost | Lowest | Medium | Highest |
| Cold-start flow | Good | Better | Best |
| High-heat protection | Good | Better | Best |
| Typical use | Older vehicles, light use | Daily drivers, light trucks | Newer engines, turbos, towing, cold climates |
When synthetic is the right call
- The manufacturer requires it — many newer engines, especially turbocharged ones, do.
- The vehicle tows, hauls or idles for long periods.
- The vehicle starts in very cold weather.
- The owner wants longer intervals between changes, where the manufacturer allows it.
Can you switch between types?
Yes. Conventional, blend and synthetic oils of the same grade and rating can be mixed or switched. The old myth that synthetic causes leaks in older engines is not a concern with modern oils.
Stock all three
Most shops and stations need all three on the shelf. RPS Distributors carries conventional, blend and full synthetic oils from Mobil 1, Castrol, Pennzoil, Quaker State, Shell, CAM2, Super S and more. Browse our Lubricants collection.
Request a wholesale quote or call 1-855-498-7509.