Parts for your 2018 Lexus Is-Engine oil

2018 Lexus IS engine oil — what it does and how to look after it

Engine oil is absolutely relevant to the 2018 Lexus IS. Lexus technical sources — the 2018 IS Owner’s Manual, Lexus Australia/NZ scheduled maintenance guides, and Toyota/Lexus Technical Information System (TIS) — specify full-synthetic engine oil for the IS 300’s 2.0‑litre turbo (8AR‑FTS) and the IS 350’s 3.5‑litre V6 (2GR‑FKS). These petrol engines require SAE 0W‑20 oil meeting API SN/ILSAC GF‑5 or later specifications. There’s no fully electric 2018 IS, so engine oil is a must-have.

In the 2018 IS, the oil isn’t just slippery stuff. It lubricates bearings and cylinder walls, cools hot spots (especially around the turbo on the IS 300), carries away contaminants to the filter, protects against rust, and helps seal the piston rings. It also acts hydraulically for variable valve timing hardware, so the right grade and cleanliness matter for smooth, quiet performance.

For Aussie and Kiwi owners, the usual service interval is every 12 months or 15,000 km, whichever comes first, as outlined by Lexus service schedules. If the car sees short trips, heavy traffic, hot climates, dusty roads, or spirited driving, especially in the turbocharged IS 300, halving the interval to around 6 months or 7,500 km is a smart move. Always use a quality filter and replace the sump plug washer at each change, then reset the maintenance reminder on the dash.

They’ll get the best results sticking with full‑synthetic 0W‑20. If 0W‑20 isn’t available in a pinch, Lexus allows 5W‑30 temporarily, but it should be swapped for 0W‑20 at the next change. Mixing brands is acceptable for top‑ups as long as the specs match, though keeping to one trusted brand is tidier.

• Check the level monthly, on level ground, with the engine warmed then rested a few minutes. Top up with the same spec.
• Watch for leaks around the filter, sump plug, and cam covers, a clean undertray helps spot drips.
• Don’t overfill — too much oil can aerate and upset VVT operation.
• Dispose of used oil responsibly at a recycling centre.

Running the correct oil, at the right interval, keeps timing chains, turbo bearings, and VVT gear happy — and helps the IS feel as sharp and refined as it should.

Popular questions about 2018 Lexus IS engine oil

What oil grade does a 2018 Lexus IS use?
For both IS 300 and IS 350, Lexus specifies full‑synthetic SAE 0W‑20 meeting API SN/ILSAC GF‑5 or newer. If 0W‑20 isn’t available, 5W‑30 can be used temporarily, but swap back to 0W‑20 at the next service for best cold‑start protection and efficiency.

How often should the oil be changed in Australia or New Zealand?
Under normal use, every 12 months or 15,000 km. For severe conditions — frequent short trips, stop‑start commuting, towing, dusty roads, hot weather, or enthusiastic driving — aim for about 6 months or 7,500 km, especially for the turbo 2.0‑litre IS 300.

Do they need to use genuine Lexus oil and filters?
Genuine parts are a safe bet, but high‑quality aftermarket oils and filters that meet Lexus specifications are fine. The key is the correct viscosity and approvals, plus a reputable filter with proper anti‑drainback and bypass characteristics.