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Most diesel engine oils carry a higher specification rating than petrol engine oils and vehicle manufacturers often specify a diesel engine oil be used in a petrol motor. This does not work in the reverse, petrol only engine oils cannot be used in diesels. Some engine oils carry both petrol and diesel specifications.

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Synthetic base oils have a number of advantages over mineral base oils. The uniformity of the synthetic oil molecules improves the thermal stability and reduces oxidation of the oil. Controlled molecular structure also results in lower volatility and a more stable vicosity over the life of the oil.

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Most modern cars run their cooling systems at temperatures close to 100 degrees celsius. The bonus of using the antifreeze chemical (glycol) in coolant is that it also raises the boiling point. This gives protection against localised or hot spot boiling which can cause engine damage.

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No, all engine treatment products should only be used as per dosage recommendations as per directions. We would also recommend to not use more than one additive in an engine at one time.

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Nulon coolants do have a shelf life. Nulon coolants that are green in colour have a shelf life of three years. Nulon coolants that are red in colour have a shelf life of five years.

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Nulon Products Australia

Manufacturing Plant

17 Yulong Close
Moorebank NSW 2170

Mailing Address

PO Box 549
Moorebank NSW 1875


Free call (Aus) 1800 679 922
Free call (NZ) 0800 454 108
International +61 2 9608 7800


Toll Free (Aus) 1800 679 970
International +612 9601 4700