- Joined
- Jan 12, 2021
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- Rochester, NY
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- Bronco Sport
What I WILL do is use Top Tier gas, and I think install a good oil catch can ("separator") setup. DI engines are terrible for carbon and sludge deposits on the valves and pistons, because a.) they are not constantly washed by a port injector, and b.) because of all the recirculated oil and unburnt fuel being pumped back into the intake by the PCV system. (PCV relieves pressure buildup in the crankcase, but for emissions reasons also recirculates all that gunk to be burnt by the engine instead of just released into the atmosphere). An even bigger problem on DI-only engines with higher compression ratios and turbo (more blowby in the cylinder). So blow it all into a catch can instead, and empty that once in while, better than burning it. Top Tier gas -- it's a program to assure that the gas has the correct detergent additives in the correct proportions to burn the cleanest.
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