23-10-2018, 08:48 PM
A colleague used to work in a garage. When cutomers asked for Redex they got a shot of Shell oil which was similarly red. The rate of cyl wear with modern engine oils is wondrously reduced compared non additive oils of 1930s/40s
I have for decades run a low geared 1600cc Hillman. I do two or three 800 mile return trips each year in addition to more local running. The car is held around a true 60mph. When lead was removed I used one of the additves but these became very expensive so I dropped. Slight recession of one valve occurs; maybe .002/3 per 10,000. Recently fitted an earlier head with seats recut to new size so it wont be a problem in my lifetime!
Many factors determine recession. At one stage my Javelin on lead could lose all clearance in 200 miles! Yet later on CNG almost none.
The local quack pellet additve was Fuelstar. Despite tests by the AA which showed it did not stop or slow recession, it was promoted with glowing references from major operators for decades. Even the army fell for it. Other combustion benefits were claimed, including for diesels (in which the combustion process is quite opposite!) The promoter got older and the establishment of a Serious Fraud Office must have been a worry so the product faded.
For over 40 years I have written a technical article for every issue of the NZ Jowett mag. In that time I have had only one complaint (and that despite several members being Poms). I rubbished Fuelstar and a convert took offence!
I have for decades run a low geared 1600cc Hillman. I do two or three 800 mile return trips each year in addition to more local running. The car is held around a true 60mph. When lead was removed I used one of the additves but these became very expensive so I dropped. Slight recession of one valve occurs; maybe .002/3 per 10,000. Recently fitted an earlier head with seats recut to new size so it wont be a problem in my lifetime!
Many factors determine recession. At one stage my Javelin on lead could lose all clearance in 200 miles! Yet later on CNG almost none.
The local quack pellet additve was Fuelstar. Despite tests by the AA which showed it did not stop or slow recession, it was promoted with glowing references from major operators for decades. Even the army fell for it. Other combustion benefits were claimed, including for diesels (in which the combustion process is quite opposite!) The promoter got older and the establishment of a Serious Fraud Office must have been a worry so the product faded.
For over 40 years I have written a technical article for every issue of the NZ Jowett mag. In that time I have had only one complaint (and that despite several members being Poms). I rubbished Fuelstar and a convert took offence!