Objective: oxidation products, sludge formation, dispersancy failure, glycol contamination, water contamination, fuel dilution, and high levels of particles.
1. place a drop or 2 of used oil on a good heavy white card (i.e. business card)
2. suspend the card, use 2 pencils on a table and place it so both ends of card resting on the pencils
3. wait couple of minutes until the oil drop is fully absorbed by the card
4. start evaluation:
- A colorless spot or slight...
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