what cleaner for a fuel dilluted engine?

[JustinH]

The engine is a supercharged 2001 4.6 mustang bullitt engine, 42lb injectors, etc.

It is tuned on the dyno very rich (safe). It goes through plugs pretty fast every 5k miles or so. I change the oil every 2k miles. What is the best method for fighting the fuel dillution?

I run Mobil 1 10w30 in the engine and motorcraft filters.

I was thinking some lube control and fuel power, but is auto-rx more appropriate?

Thanks,
Justin

 

[Quest]

Because the root cause of the problem is still fuel-dilution due to overly-rich tunning of F/A ratio, your best bet would be to overcome that part (lean it out a bit?)

Try covering your root problem with thicker oil isn't going to help (if any) for fuel dilution would still damage the protective properties of any typical motor oil has originally (particularly shear properties).

Another way around this is to change your motor oil more frequently (2K you say? how about every 800miles?) or do an UOA to determine your OCI.

 

[Quest]

Try running AutoRx if possible. But then again, due to severe oil dilution caused by excessively rich F/A ratio, I wonder if you can get to the 1500mile mark with 1 dose of AutoRx?

 

[BlazerLT]

I would lean the fuel mixture a bit.

No sense having a top performing engine that is wearing itself out prematurely with every mile.

 

[andyd]

uhhmn I dont think Auto RX is indicated. The innards of an engine with gassed out oil are prolly squeaky clean. I'm just a shade tree hack, but I think you have to decide what you want, max performance or longer engine life. P'raps using water injection instead of excess fuel to keep temps down may work

 

[theguru]

A thicker oil is often used where fuel dilution is a problem. Deosn't solve the problem but it starts at a higher viscosity and thins with the fuel.

Of course you can lean the mixture, but this isn't always a choice and the richer mixture is usually to prevent detonation under high boost.

You may simply have to change more often.

 

[T-Keith]

Check out my used oil analysis with high fuel dilution and LC, they seemed to do very well.

-T