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