From a recent oil analysis on my older Volvo 850 NA engine I found that 8oz (1/3 of a bottle) run in the oil for 500 miles had a relatively minor effect on the viscosity of the oil that was in at the time.
Specifically, the 100c cst was 12.7 for the fill of 1gal T6 + 1.5qt Rotella T 15-40 (see my post in the oil analysis forum for details). The original 100c viscosity of both of these is around 14.5 if I remember right, so the addition of the 8oz of Seafoam in addition to the roughly 3000 miles of shearing in the engine lowered the viscosity down to approximately a 30wt oil. Not too bad I would guess, but that's for the experts to decide.
In my searcing for info on the effects of Seafoam I wasn't able to find much more than conjecture, so I thought I'd post this for others thinking about using it or similar products.
Specifically, the 100c cst was 12.7 for the fill of 1gal T6 + 1.5qt Rotella T 15-40 (see my post in the oil analysis forum for details). The original 100c viscosity of both of these is around 14.5 if I remember right, so the addition of the 8oz of Seafoam in addition to the roughly 3000 miles of shearing in the engine lowered the viscosity down to approximately a 30wt oil. Not too bad I would guess, but that's for the experts to decide.
In my searcing for info on the effects of Seafoam I wasn't able to find much more than conjecture, so I thought I'd post this for others thinking about using it or similar products.
