Can anyone advise on the correct spark plugs for the 3.5L Mk5 engine?
The service manual specifies L10, and the modern equivalent is the L86C which is a short reach relatively “hot” plug used in many motorcycles.
Does the 3.5L really need a short-reach plug? the cylinder head thread seems much deeper, adequate for a normal plug?
I am currently just using some spare plugs I had in stock from another car, Bosch Super 4 R6, but apparently they are too cold, and I have also been advised they cause problems with old ignition systems, and I should stay with a normal single electrode plug.