Recently, a fellow classic car enthusiast encountered a common yet concerning issue with their newly acquired ’72 Mercedes 280SE 4.5. After bringing this vintage beauty home, routine maintenance at a national chain tire and battery store inadvertently led to some new mechanical worries. This situation highlights the importance of specialized knowledge when caring for classic 72 Mercedes models, particularly regarding something as fundamental as engine oil.
The owner initially brought their ’72 Mercedes in for new front tires and a general check-up, including fluid changes. Shortly after this service, they noticed two significant changes in their ’72 Mercedes‘ performance: a noticeably louder engine and a dramatic shift in oil pressure readings. Previously, the oil pressure gauge would register about a third of the way up at idle, and shoot to the maximum when accelerating. Now, the gauge barely moved off zero at idle and only reached about halfway when the accelerator was pressed. This drastic change in oil pressure is a clear indicator that something is amiss and requires immediate attention, especially in a cherished ’72 Mercedes.
Seeking expert advice, the owner contacted a Mercedes-Benz specialist, Dan Pool Mercedes. The first question from the specialist immediately pinpointed a likely culprit: the engine oil weight. It turned out the national chain had used 5W30 oil. The specialist’s reaction – a laugh – underscored the inappropriateness of this choice for a ’72 Mercedes. According to the owner’s manual, the recommended oil for year-round use in a ’72 Mercedes 280SE 4.5 is a multigrade oil such as 10W-40 or 10W-50. The specialist, however, suggested 15W40.
This discrepancy between the manual’s recommendations and the mechanic’s advice raises a valid question: which oil is truly the best for a ’72 Mercedes 280SE 4.5? While modern, lighter oils like 5W30 are designed for newer engines with tighter tolerances, classic engines like those in a ’72 Mercedes often benefit from thicker oils. The original manual suggests 10W-40 or 10W-50, which are certainly more appropriate than 5W30. The 15W40 recommendation from the specialist is also a viable option, often favored in warmer climates or for engines with slightly higher mileage, as it provides even greater protection and can help maintain oil pressure in older engines like those found in a ’72 Mercedes.
Alt text: Detailed view of a classic Mercedes-Benz 280SE 4.5 engine bay, showcasing the robust engine components typical of 72 Mercedes models.
In conclusion, for a ’72 Mercedes 280SE 4.5, switching from the mistakenly used 5W30 to a 15W40 or even a 10W40 oil is highly recommended and likely to resolve the oil pressure issue. The increased engine noise could also be related to the thinner oil not providing adequate lubrication. It’s crucial for owners of classic vehicles like this ’72 Mercedes to rely on expert advice and consult their owner’s manual for guidance on maintenance, especially when it comes to vital fluids like engine oil. Using the correct oil weight is not just about maintaining oil pressure; it’s about ensuring the longevity and optimal performance of your treasured ’72 Mercedes for years to come. Always prioritize expertise when servicing your classic Mercedes to avoid simple errors that can lead to bigger problems.
