Mine is the stock parallel valve experimental IO-360 purchased through vans. Flying now for 4 years, about 350 hours. It has always run cold, as lo as 125F with OATs in the 30s -40s and never more than 185F with OAT at 90F. I've been using tape to block the oil cooler in the winder and taking the tape off when it warms up, but I'm tired of that routine and want to be able to control flow from the cockpit. I have scrupulously verified that my oil temp sensor is accurate. I am considering removing and testing the vernatherm, but it seem rare for them to fail in the extended position. More often vernatherm failures result in high oil temps. So I'm ging to order the Anti-Splat shutter and install it and see how that works. I'm just looking for installation photos to review before I start.