nine7one

I was talking with an older guy who was a long time auto enthusiast and collector. He told me that, since my 1990 944 Cabriolet was made before the widespread use of ethanol that the engine, hoses, fuel lines, etc. were not engineered for ethanol and he recommended I use an ethanol fuel conditioner. He also suggested using an octane booster on top of premium fuel.

I only fill the tank a few times a year so cost is not an issue. The way he explained it all to me made sense to me. My question is: is there any reason not to follow his advice? Thanks

mel_t_vin

Not a big proponent of additives...have done neither during my 19+ years of stewardship.

My solution...only 91+ from Chevron [or Shell]. YMMV...

V2Rocket

Your car's original fuel system is fine to deal with ethanol-content fuel.
It is a good idea to replace all the hoses anyways, simply due to age (26 years !).

Octane booster isn't necessary - all "they" do is start with a lower-octane gasoline mixture and add the required ethanol mixture (varies by state) to make the "rated" octane on the pump.

A 944S2 needs 91 octane (US AKI scale), more than that is wasted pennies..

porscharu

I always use 93 octane and put in sta-bil storage when it is put up for the winter. I have no evidence but just piece of mind.

jhowell371

Make sure you fuel injection hose lined with Teflon like your factory lines. Ethanol l will make regular gas line as limp as a noodle in short order. Been there done that.

peanut

I've never been a fan of fuel additives either.

If you refer to the Bosch fuel injection and engine management manual they recommend that we do not use fuel additives because there is a very good chance that plaque removed from the fuel rail can block the tiny fuel filters in the Injectors .

Much better to remove the fuel rail and flush the system seperately and get the injectors cleaned and tested professionally . They'll clean them ultrasonically set the spray patterns and you'll benefit from a huge reduction in emissions too.