Okie, after 1.5months/ 5000km+ trial on my 2006 Vios (130K+ millage) with
1) Duckham 2T (Jaso FC rated), $112.50/L
tested it in 1:1000 ratio in the begining and can feel the smoothness of the engine once added, FC increase only by 2%+. Increase the dossage to 1: 800. Engine become very quiet and vibration on the engine vibration is reduce very much, FC increased by 2%+ as well... 3 round using 1:500 ratio, not much improvement on the engine smoothness and quietness... FC improved by more than 10% suddently due to changed in driving habbit during festive seasons so not accurate...
Remark: stop the test with 1 full tank before i continue with Castrol 2T.
2) Castrol 2T (Jaso FD rated), $17.50/L
Tested at 1:500 ratio, engine as quiet as Duckham 2T at same ratio. FC improved by slightly more at 5%+, increase the ratio further to 1:400 on the next tank of petrol and FC improved closed to 7%. Engine smoothness not improved, same as 1:500 ratio...
Stop 2 x 1/2 tank before i continue with Penzoil marine...
3) Penzoil Marine (TCW3 rated). RM18/L,
1st tank at 1:500 ratio, improvement only by marginal 3%. engine smoothness equivalent to Castrol & Duckham 2T at the same ratio. imcrease the dossage to 1:400 for 2 tanks and the FC improved to 5%+ for both tank.... engine smoothness and quietness remain the same as 1:500 ratio. Spark plug
... checked and inspected, no sign of foul or oil on the sparkplug.
Summary: Financially, it is feasible to add the 2T at 1:400 to 1:500 ratio so long your 2T doesnt cost you anything more than $20/L. The 2T added can improved the FC by slightly more than 5% on average. Jaso FD rated 2T seems to give a better result over TCW3 rated 2T. 2T obvious work very well as a upper cylinder lubricant and reduce the friction at the combustion chamber and provide a very significant improvement over engine smoothness and quiet ride...
for those who is looking for smoother engine, 1:800 ratio is sufficient.
I will continue to use the 2T at 1:500 ratio and will do a top overhaul on my Vios at around 200K+ millage. By then, i can take a look on my piston and comment if there is any negative effect using 2T as petrol additive.
Edited by Tigershark1976, 22 March 2010 - 04:38 PM.