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[
] My Porsche is a 911SC, 204 bhp 1981vintage.
Now Shell is doing away with 4 Star by the end of this year I am at a loss of what to do !
Some say use Shell 95 octaine.
Some say use Shell Opitmax 98 octaine.
Some say use an additive with 95 or 98 octaine.
The hand book states 98octaine for 204 bhp models only.
Are the valves hard enough to use 95 and would I need to adjust the timing; or just use 95 and see if she "pinks"?????
While we are at it is Mobil 1 the best oil for her and how long for an oil change 6k or 12k ?
Now Shell is doing away with 4 Star by the end of this year I am at a loss of what to do !
Some say use Shell 95 octaine.
Some say use Shell Opitmax 98 octaine.
Some say use an additive with 95 or 98 octaine.
The hand book states 98octaine for 204 bhp models only.
Are the valves hard enough to use 95 and would I need to adjust the timing; or just use 95 and see if she "pinks"?????
While we are at it is Mobil 1 the best oil for her and how long for an oil change 6k or 12k ?
![Tr50175.jpg](https://www.porscheclubgb.com/forum/legacymedia/upfiles/1974/Tr50175.jpg)