We've all seen the UOA's with high silicon & low iron in newer engines - this is supposedly blamed on sealants used when manufacturing the engines. TooSlick has said that certain engines (Fords and others) will show high silicon until at least 50k miles. I accepted this until I saw a UOA on a Ford 4.2L that only had 7,200 miles on the engine with 3,100 on the oil. The silicon was at 9 ppm. THe thing is that this engine ran the 3,100 miles in less than a month. This got me thinking that the silicon is released over time and mileage has nothing to do with it.
If this theory is correct, then a 12 month old vehicle with 90k miles could still show high silicon from sealants if the OCI was decreased to 3,000 miles over 3-5 months.
Any thoughts?
If this theory is correct, then a 12 month old vehicle with 90k miles could still show high silicon from sealants if the OCI was decreased to 3,000 miles over 3-5 months.
Any thoughts?