Initial Oil Change
Pit Crew
Joined: Nov 2024
Posts: 249
Likes: 82
From: FL
Lexus Test Driver
Joined: Mar 2016
Posts: 9,510
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In that case, I would switch to a 3K OCI. That's pretty strong dilution. I wonder if such dilution is inherent to the A25A design in general or due to hybrid operation (short trips/frequent starts and stops)
Racer
Joined: Jan 2004
Posts: 1,889
Likes: 456
From: North Carolina
It has nothing to do with tech. Piston ring blow-by is very real and tech will never eliminate this on any ICE. BTW, did you ever look in your 2025 ES "Warranty And Service Guide"? It states the free service is at 5,000 miles. You can change your oil anytime you want to but to reduce long term engine wear you should change it every 5,000 miles for normal service. I know this to be true. I've owned many vehicles that have lasted over 300K miles. No need to change my regimen now.
Pit Crew
Joined: Nov 2024
Posts: 249
Likes: 82
From: FL
My car is a 2020 ES300h and I looked in there and then downloaded the 2025 ES350 and I don't see anything mentioning changing at 5k outside of special operating conditions or doing so to reduce long term engine wear. Please tell what page you see this on so we will all know.
Racer
Joined: Jan 2004
Posts: 1,889
Likes: 456
From: North Carolina
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Racer
Joined: Jan 2004
Posts: 1,889
Likes: 456
From: North Carolina
Note that it is also for Severe Operating Conditions. There is not anything wrong in changing early and can only help especially in your situation of keeping cars a long time. As a ME you know that any device once turned on starts towards the end of its life and in a car increasing maintenance will prolong its ultimate demise.
Pit Crew
Joined: Nov 2024
Posts: 249
Likes: 82
From: FL
Note that it is also for Severe Operating Conditions. There is not anything wrong in changing early and can only help especially in your situation of keeping cars a long time. As a ME you know that any device once turned on starts towards the end of its life and in a car increasing maintenance will prolong its ultimate demise.
Pit Crew
Joined: Nov 2024
Posts: 249
Likes: 82
From: FL
You wanna guess what I’ll be telling my service advisor? I need the free oil & filter change Mr Advisor. I’ve been to a few HPDE track events at Daytona and really pushed the car hard.
Lexus Test Driver
Joined: Jul 2017
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From: NJ
They are unlikely to give you the free one at 5K. I'm on my third Lexus and have tried that with every one.
Lead Lap
Joined: Jun 2014
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From: MI
Instructor
Joined: Aug 2023
Posts: 989
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From: PR
Correct! My oil change freebies are at 10k, 20k, 30k & 40k. No freebie for me at 5k intervals, have to pay for any in between; which I don't mind.
In another forum, someone pointed out that the measured (Scangauge 3) oil temp on the A25A-FXS sit mostly at 160-165F; with sustained highway driving (1hr) at 70mph barely getting to 180F unless uphill when it hit 190F. That could definitely explains why the Owners Manual suggests 5k instead of 10k for "Special Operating Conditions" which includes short trips & idling. Still based on the UOA of the RAV4 Hybrid user, keeping a low fuel dilution <2.4% will require 3-4k which sits near the 5k OCI but definitely not the regular 10k OCI. Maybe a few Italian Tune-ups here and there will help drop the % when doing 5K.
In another forum, someone pointed out that the measured (Scangauge 3) oil temp on the A25A-FXS sit mostly at 160-165F; with sustained highway driving (1hr) at 70mph barely getting to 180F unless uphill when it hit 190F. That could definitely explains why the Owners Manual suggests 5k instead of 10k for "Special Operating Conditions" which includes short trips & idling. Still based on the UOA of the RAV4 Hybrid user, keeping a low fuel dilution <2.4% will require 3-4k which sits near the 5k OCI but definitely not the regular 10k OCI. Maybe a few Italian Tune-ups here and there will help drop the % when doing 5K.
Last edited by scubapr; Jan 2, 2025 at 01:01 PM. Reason: Fix: Severe -> *Special* Operating Conditions