I used Mobil full synthetic on my cars and results are
1) 2010 Odyssey with 60K - Used 0W30 (should had 0W20). Engine is loud and rough to notice. MPG suffered like .5 -1 mpg. Went from Pennzoil 0W20. Went back to this one and all is good.
2) 2002 Passat 1.8T - 126K - Used 0W40. Engine is loud, not rough. Can hear the cam chain noise slightly. MPG is slightly affected. Went from Castrol 0W30
3) 2000 BMW Z3 2.5 - 129K - Used 0W40. Engine is smooth, but the cam chain noise like rrrr, rrr, rrr. Tried Castrol GTX 5W30, noise immediately went away. To confirm, i tried two times. Both times, the noise was cured by Castrol. It is something like the chain is touching the Valve cover. MPG is same for both
Passat / Z3, i did Auto - RX and no sludge inside (both of them, i removed the valve cover and it is clean). Some how, the Mobil 0W40, is not making enough pressure for the secondary timing chain tensioner OR something else. I am almost positive that a new secondary tensioner will fix this (On Z3).
Why it is happening only with the Mobil full synthetic? For Passat, i was using it for long time and i think about 3-4 years back, it started doing this (loud). BMW i bought it used in 2012 and any time i use Mobil 0W40, it makes the noise. Did any one had this noise?
Also read good reviews about Rotella T6. It cleans better and runs silent. Thought of trying that. Dont want to change the tensioner if i can fix it with oil change. Changing tensioner is a time consuming job (Need to remove the VANOS and then etc).
Thanks in advance.
1) 2010 Odyssey with 60K - Used 0W30 (should had 0W20). Engine is loud and rough to notice. MPG suffered like .5 -1 mpg. Went from Pennzoil 0W20. Went back to this one and all is good.
2) 2002 Passat 1.8T - 126K - Used 0W40. Engine is loud, not rough. Can hear the cam chain noise slightly. MPG is slightly affected. Went from Castrol 0W30
3) 2000 BMW Z3 2.5 - 129K - Used 0W40. Engine is smooth, but the cam chain noise like rrrr, rrr, rrr. Tried Castrol GTX 5W30, noise immediately went away. To confirm, i tried two times. Both times, the noise was cured by Castrol. It is something like the chain is touching the Valve cover. MPG is same for both
Passat / Z3, i did Auto - RX and no sludge inside (both of them, i removed the valve cover and it is clean). Some how, the Mobil 0W40, is not making enough pressure for the secondary timing chain tensioner OR something else. I am almost positive that a new secondary tensioner will fix this (On Z3).
Why it is happening only with the Mobil full synthetic? For Passat, i was using it for long time and i think about 3-4 years back, it started doing this (loud). BMW i bought it used in 2012 and any time i use Mobil 0W40, it makes the noise. Did any one had this noise?
Also read good reviews about Rotella T6. It cleans better and runs silent. Thought of trying that. Dont want to change the tensioner if i can fix it with oil change. Changing tensioner is a time consuming job (Need to remove the VANOS and then etc).
Thanks in advance.