Strong gas smell in my oil

Having seen such a statement in more than a handful of posts around here, I've been wondering what would cause such scenario? Does newer engine have worse tolerances and allows a lot of gas insemination into the oil?

Please educate. As a side note, mine never has any gas smell during oil change; just used oil smell.

 

No, the newer engine is direct injected and it causes more fuel contamination than port injection. Port injection sprays the fuel in before the cylinders and so it better atomized and mixes with the air whereas the direct injection is spraying directly in the cylinder and can cause fuel to slip between past the piston rings. This is especially true when the engine is cold.

Direct injected motors are more susceptible to fuel dilution of the oil when they are not driven hot. If you are short tripping it a lot and not giving it a chance to get up to fully saturated operating temperature it can cause the fuel to build up more and not "burn" off out of the oil.

My personal opinion, after spending far too much time on F150 Ecoboost forums, is that the trucks that were driven the hardest were actually the ones that had the least oil related issues(timing chains and turbos and whatnot.) If you are short tripping the truck a lot and not really getting it hot, I would suggest shorter OCI's to remove that fuel earlier. Things like timing chains are passively lubricated by non-pressurized oil, and so the oils properties are important in keeping the chain links and pins separated and lubed.

 

I have a feeling the 10k OCI combined with fuel contamination in the oil is causing the premature bearing failures.

 

I've had that theory too, I've seen a couple Blackstone oil reports from 3rd gen owners that had higher than acceptable gas levels in the oil.

 

And that they use 0W-20. Doesnt leave much wiggle room for fuel bringing down the viscosity.

Ford tried to use 5W-20 when the 3.5L EB came out, but after a couple years they all were switched to 5W-30.

 

The V35-ATS Engine has BOTH port and direct injection (D4-S system). It is a fairly complex system, but the port injection keep out carbon deposits on the intake valves (big issues for a lot of BMW engines). When an engine is running, there are always trace amounts of unburnt fuel, combustion byproducts, and carbon debris that get forced past the rings and into the crankcase, which can be multipled some by higher pressures created by turbos and cars with only direct injection.

The D-4S tends to run off port injection when the engine is cold, and largely mitigates fuel dilution. A lot of direct injection hybrids have this issue as the engine runs cold a lot.

I'd be surprised if a large number of 3rd Gen Tundra owners getting Blackstone reports end up with substantial oil dilution.

Still, changing a turbo motors oil more frequently in never a bad idea.

 

No no no no no...

 

Dealer trip,, that is what I would do. Could not hurt.

 

Im aware, but there is always some DI used if its anything like the Ecoboost. They(Ford) never actually shut off the DI injectors.

 

Reports are already out there with a bit higher dilution than normal.

@Eurodriver I use Amsoil kits, Blackstone has given me very different reports on similar oil conditions.

 

Yes, that's what I'm using.

 

What is the percentages being seen? Turbos are always going to be a bit higher due to the excess pressure. A couple % is normal.

 

I just looked at your report. I think I recall seeing under 2.4% being normal, your last change was in spec. I'd guess your next analysis will be similar.