FAQ
TL;DR: For the Opel Signum 2.2 DTI (2003) with the AF33 auto, the practical change interval is 60,000 km; “We replace every 60,000 km.” [Elektroda, ozon79, post #16991396]
Why it matters: This FAQ helps owners decide when and how to service AF33 transmission fluid to extend gearbox life and avoid avoidable shift issues.
Quick Facts
- Gearbox: AF33, 5‑speed automatic used in the 2.2 DTI Signum. [Elektroda, romuald-f, post #16987159]
- Fluid spec: JWS‑standard ATF; brand is not critical if it meets JWS. [Elektroda, romuald-f, post #16987159]
- Interval: Replace ATF about every 60,000 km under normal use. [Elektroda, ozon79, post #16991396]
- Filter: Built into the transmission; not replaceable during routine service. [Elektroda, romuald-f, post #16987159]
- Risk note: Post‑change harsh shifts can appear if wear exists; proceed, but "at your own risk." [Elektroda, rob4028, post #16991446]
Should I change ATF at 250,000 km on a 2003 Opel Signum 2.2 DTI?
Yes, if the gearbox operates normally, replace the ATF. Owners report a 60,000 km service rhythm. One user changed for the first time at 173,000 km and then drove another 80,000 km without issues. Follow the JWS ATF spec and verify correct level after refilling. [Elektroda, migmig85, post #16996170]
What automatic transmission is in this car, and what fluid does it take?
Your Signum 2.2 DTI uses the AF33 five‑speed automatic. It requires ATF that meets the JWS standard; the brand does not matter when the fluid meets the spec. Do not plan on replacing the internal filter during routine service. [Elektroda, romuald-f, post #16987159]
Is a black color in ATF a reason not to change it?
No. ATF darkens through use and heat. A contributor notes fluid color change is normal, and still advises replacement every 60,000 km. If the transmission currently shifts fine, a measured drain and refill helps restore lubrication. “Each oil changes its color under the influence of work.” [Elektroda, ozon79, post #16991396]
My mechanic warned changing old ATF could make it worse. True?
There is a risk if wear already exists. Another user cautions that post‑service the box might start to jerk when shifting. This does not mean the change caused damage; fresh fluid can unmask existing clutch or valve body issues. Proceed, but understand the risk. [Elektroda, rob4028, post #16991446]
How often should I change AF33 transmission oil?
Target every 60,000 km. That cadence appears repeatedly in owner guidance and aligns with preserving shift quality. If your last change was around 52,000 km ago, plan one now to stay on schedule and maintain protection. [Elektroda, ozon79, post #16991396]
Is the AF33 transmission oil filter replaceable during service?
No. The AF33 uses an internal, non‑serviceable filter during routine maintenance. Plan for a drain‑and‑fill of the ATF only. This design choice is noted by owners and means you should keep the fluid interval consistent. [Elektroda, romuald-f, post #16987159]
What is AF33, in simple terms?
AF33 is a 5‑speed automatic transmission used in your Signum 2.2 DTI. Owners identify it in this model year and engine combination. Knowing this code ensures you buy the correct JWS‑spec ATF and follow relevant service notes. [Elektroda, romuald-f, post #16987159]
What does JWS ATF mean?
JWS denotes the performance standard your ATF must meet for the AF33. The forum advice states the manufacturer is not important so long as the oil meets the JWS spec. Always verify the label states JWS compliance. [Elektroda, romuald-f, post #16987159]
Quick decision guide: change now or wait?
Use this 3‑step check: 1) Confirm gearbox: AF33. 2) Check mileage since last change; aim for 60,000 km. 3) Confirm you have JWS‑spec ATF. If all align, proceed with a drain‑and‑fill. This balances maintenance with known AF33 constraints. [Elektroda, romuald-f, post #16987159]
What symptoms suggest I should be cautious after changing ATF?
Watch for new jerks during shifts or flare between gears after the change. One owner notes it may start to jerk if wear already exists. If symptoms appear, stop aggressive driving and have a specialist assess solenoids and clutch packs. [Elektroda, rob4028, post #16991446]
Is it okay to change ATF even if the carmaker once said it’s ‘lifetime’?
Yes. An owner changed so‑called lifetime ATF at 173,000 km, then drove another 80,000 km trouble‑free. Regular changes reduce oxidation, restore friction modifiers, and protect the AF33’s internals over high mileages. [Elektroda, migmig85, post #16996170]
What if my ATF smells burnt or like worn clutch?
A burnt odor signals degraded fluid and possible clutch wear. One mechanic reported a worn‑clutch smell, and the owner sought advice. Replace fluid to restore lubrication, but monitor closely afterward for shift quality changes. [Elektroda, czelo, post #16987688]
Can I choose any ATF brand for the AF33?
Yes, if it explicitly meets the JWS specification. The brand is secondary to the spec match. Select a reputable label, verify JWS on the datasheet, and refill to the correct level and temperature range. [Elektroda, romuald-f, post #16987159]
What’s the practical benefit of keeping the 60,000 km interval?
It stabilizes shift feel and extends component life. One owner emphasized routine changes regardless of color, noting darkening is natural. Sticking to 60,000 km keeps additives fresh and mitigates varnish buildup in the valve body. [Elektroda, ozon79, post #16991396]
I changed ATF around 52,000 km ago—should I wait?
Plan the next service soon. The interval guidance is about 60,000 km, so you are near the target. Schedule a drain‑and‑fill with JWS‑spec fluid and check level precisely to maintain reliability. [Elektroda, czelo, post #16987688]
Any final expert tip before booking the service?
Choose a shop familiar with AF33 level‑setting and JWS fluids. As one user put it: “change, but at your own risk,” acknowledging worn boxes may reveal issues after fresh ATF. Communicate expectations before work starts. [Elektroda, rob4028, post #16991446]
to the very end it was OK the filter was not replaceable because it was mounted centrally and you would have to disassemble the boxes.
thanks
