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I have been using diesel to flush my engine when doing oil changes for many, many years. For the past 2 years, I have done about 12 oil changes to desludge my Toyota 2006 Aurion engine. In that time, I have not used a commercial product. After a few false starts, I think that the engine is finally sludge free. However, a few recent posts got me thinking about whether my engine could be still badly sludged and it was time to change over to a commercial product. Penrite engine flush is currently on special at Autobarn [25% discount] so that is the product I used for this comparison effectiveness test. I cleaned the oil filter cartridge and housing of any sludge particles, dropped the used engine oil [about 1 month old] then did an engine flush with 6 litres of diesel. Following photo shows the results. Cleaned the oil filter cartridge and housing of any sludge particles, dropped the diesel then filled with new oil and performed the Penrite engine flush. What I did notice was while the engine was running during the Penrite engine flush, the engine was idling a lower revs approx. 600 instead of the usual 700. Guess this is the effect of the oil being thinned during the treatment. After photo does show sludge particles and the oil was not too badly contaminated. Overall quite happy with these results for my 2006 Aurion engine. I will say that I am encouraged to possibly include the Penrite engine flush in my maintenance schedule. I have a 2008 Aurion as my project car so thinking about doing a future comparison doing a Penrite engine flush first then the diesel flush as a follow up.