Fuel additive
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#19
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My dealer actually said that during oil service, they also do a fuel injection cleaning (additive).
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I usually fill the car with 100 octane from a local (specialty) fuel station (76) I only put the 91 octane in if I have to (running low and no good gas within range). I wonder if the 100 octane has techron (or similar in it) any thoughts? should I additionally add techron periodically.
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I Just checked the 997/S manual: nothing advising against using additives.
Then I checked the 997TT manual and there IS an advisory against using additives:
WTF? Heck. Just do what you want with Techron I guess. However Just say "no" to nitro.
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#22
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little percentage of it sip through your piston rings/dilutes into your oil/lube system, which degrades oil lubrication properties. thats why pro advices before oil change.
#23
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I usually fill the car with 100 octane from a local (specialty) fuel station (76) I only put the 91 octane in if I have to (running low and no good gas within range). I wonder if the 100 octane has techron (or similar in it) any thoughts? should I additionally add techron periodically.
You are wasting your money filling up with 100 gas. To get a 93 blend (the correct octane for our cars) you need 4 gallons of 100 and 12 gallons of 91 for a 16 gallon tank.
#24
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I usually fill the car with 100 octane from a local (specialty) fuel station (76) I only put the 91 octane in if I have to (running low and no good gas within range). I wonder if the 100 octane has techron (or similar in it) any thoughts? should I additionally add techron periodically.
Whether it does not doesn't, you're wasting your money. Switch to using a top tier gas -- premium grade -- and bought from a busy station, saving the racing gas for well racing.
Sure, the premium gas available in CA has less octane than Porsche recommends -- by one or two octane points -- but the difference in what you're paying for 100 octane gas is costing you way more money in higher fuel cost for that one or two point octane gain. Any octane over the engine's stated octane requirements is just wasted octane.
(Some engines can have their octane requirement go up with miles as carbon and other stuff builds upon combustion surfaces but using a good gasoline should see this build up reduced or even eliminated after some miles.)
You can hurry the process up by just before next oil change using a bottle even two of Techron according to directions then after oil change switching from using race gas all the time to a quality premium non race gas.
Of course, when (if) you track the car use race gas.
Sincerely,
Macster.
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#28
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Primarily this is how the deposits form on the intake valves in the first place.
The second source of intake valve deposists are from the crankcase fumes routed from the engine crankcase by the AOS into the intake manifold. Keeping the oil level below max. can help keep the oil vapor content of these fumes lower -- the AOS is not 100% effective at removing all oil vapor from the crankcase fumes before routing the fumes to the intake manifold -- and thus intake valve buildup down.
Anyhow, as a result a fuel additive can reach the intake valves in vapor form -- maybe even liquid form shortly after a cold engine start -- and upon reaching the valves condense into liquid form cause the intake valves are of course cooler.
In either vapor or liquid form the fuel additive if it had any detergent aspect could help keep the intake valves clean.
Sincerely,
Macster.
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Apparently one or more of my assumptions is faulty!
#30